[nimbly1]

Fixes #1466

Problem

configure() in src/config.js destructured reactStrictMode out of the new config and always wrote it back. When a caller configured only other options, the destructured value was undefined, so a previously configured reactStrictMode: true was silently reset to undefined:

configure({reactStrictMode: true})
configure({testIdAttribute: 'not-data-testid'})
getConfig().reactStrictMode // undefined, expected true

Change

Keep the existing value when the new config does not provide one:

reactStrictMode: reactStrictMode ?? configForRTL.reactStrictMode,

Explicitly passing reactStrictMode: true or false still overwrites it, and the function form of configure() behaves as before.

Test

Added configure without reactStrictMode preserves the existing value in src/__tests__/config.js. It sets reactStrictMode: true, configures an unrelated option, asserts the value is still true, then asserts an explicit false still applies.

• Before the fix, the new test fails at expect(getConfig().reactStrictMode).toBe(true).
• After the fix: full Jest suite passes (249 passed, 3 skipped), and npm run lint and npm run typecheck are clean.

[chatgpt-codex-connector]

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📝 Code Review	⚠️ Failed 2026-10-27T00:58:43.925512Z We couldn’t complete this review. Comment @codex review to try again.	3b551ca	Manual request

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[nimbly1]

@codex review

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